Portion of a carton



FIG. 1 is a front perspective view of a portion of a carton of the present invention shown in a position of use as part of a carton structure in broken line;

FIG. 2 is a plan view of the outer surface of the design of FIG. 1 shown in an alternate position of use; and,

FIG. 3 is a rear perspective view of the design of FIG. 1 in a third position of use.

The claim is directed to the solid lines and the area within solid lines. The carton drawn in broken lines represents unclaimed environmental subject matter. 

The ornamental design for a portion of a carton, as shown and described. 